Here in the land of the continental climate, mean annual temperatures are now at their peak, just two weeks after summer solstice. Here's a plot of the NCDC 1981-2010 normal daily mean temperature for June and July at Fairbanks:
The slower decline after the peak in early July is due to increased cloud cover, higher dew points and higher soil temperatures in late July than early June. This results in normal low temperatures falling more slowly than normal high temperatures (so the mean diurnal range is less).
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